Ornamental-stitch sewing-machine.



Patent@ Apr. 24

.5. H. MOFFAW.

ORNAMENTAL STITCH SEWING MACHNE.

I ya APPucATfoN FILED UNE 4, 1915. g

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ORNAMENTAL STITCH SEWING MACHINE.

APPLICATION FILED IIINE 4, 19:5.

l ,2239? 9.. aented Apr. 24, 1917.

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J. R. IVIOFFATT.

ORNAMENTAL STH'CH SEWING MACHINE.

APPLICATION FILED 1uNE4. |915.

Patented Apr. 24, 1917.

5 SHEETS-SHEE 3- 1. R. MOFFATT.

ORNAMENT/IL STITCH SEWING MACHINE.

APPLICATION FlLED JUNE 4.19I5': 1,223,71 9., Patented Apr. 24,1917.

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J. R. IVIOFFATT.

ORNAMENAL STITCH SEWING MACHINE.

APPLICATION HLED JUNE, i915.

Patented Apr. 24, 1917.

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FICE.

JAMES R. MOFFATT, OF CHICAGO. ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION.

Specification of Letters Patent.

Patented Apr. 24, 1917.

Application filed June 4, 1915. Serial No. 32,129.

To all 'whom it may concern:

Be it known that I, JAMES R. MOFFATT, a citizen of the United States, residing at Chi cago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Ornamental-Stitch Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in ornamental stitch sewing machines, and more particularly to a sewing machine, wherein an ornamental thread is laid back and forth on the upper face of the fabric and stitched thereto by a plurality of lines of parallel stitching.

An object of the invention is to provide a machine of the above character, wherein a plurality of independently operated guides, each carrying an ornamental thread, cooperate successively with devices which engage the ornamental threads between the guides and the fabric for forming loops therein.

A further object of the invention is to provide a machine of the above character, wherein a set of devices at each side of the line of feed cooperates respectively first with one thread guide and then the other to form loops in the ornamental thread for the entrance of the needle.

A further object of the invention is to provide a machine having a plurality of spaced needles and two ornamental thread guiding members with devices which operate simultaneously upon the respective ornas mental threads to form half twisted loops therein for the entrance of the respective needles.

A still further object of the invention is to provide a stitch forming mechanism having a plurality of needles with means for forming a double figure 8 ornamental stitch which is secured to the fabric by the stitches formed by the needle threads. y

These and otherobjects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings which show by way of illustration one embodiment of the invention,-

Figure 1 is a view partly in front elevation and partly in section, showing the forward end of a sewing machine having my improvements applied thereto;

Fig. 2 is a rear view of the machine;

Fig. 8 is an end view of the same;

Fig. l is a view partly in section and partly in plan, showing the mechanism which cooperates with the thread guides for forming the double figure 8 stitch;

Fig. 5 is a detail showing in side elevation the presser foot and the thread deflector carried thereby;

Fig. 6 is a plan view showing diagram matically one of the positions of the thread guides and the manipulating devices for the ornamental thread;

Fig. 7 isa similar view showing the ornamental threads engaged by the thread hooks and carried rearwardly against the for` wardly moving thread lingers;

Fig. 8 is an enlarged detail of one of the thread hooks;

Fig. 9 is an enlarged detail of one of the thread fingers; and

Fig. 10 is a plan view showing on an enlarged scale a fabric having the ornamental double ligure 8 stitch applied thereto.

The invention consists broadly in a sewing machine having a plurality of needles, preferably three, although two needles may be used, with which a single looper cooperates beneath the fabric. Cooperating with these needles are two independent ornamental thread guiding members which are moved across the line of feed or from each side to the other for each complete reciprocation of the'needles. Cooperating with the thread guides, at each side of the line of feed, is a thread hook, an ornamental thread finger and a thread deflector. The thread hook and the thread finger are moved in opposite directions and in a line substantially parallel with the line of feed. The thread hook moves forward into engagement with the ornamental thread carriedby the guide, which guide, for the time being, is on the same side of the line of feed as said thread hook, the deflector assisting in causing the hook to engage the ornamental thread. As the hook carries the thread rearwardly, the

ythread linger engages the ornamental thread and the thread guide moves to the opposite side of the line of feed. These movements result in the forming of half twisted loops on the opposite side of the line of feed in the respective ornamental threads, which half twisted loops are entered by the outer needles respectively and stitched to the fabric. The result is a double figure 8 stitch.

Referring more in detail to the drawings, I have shown my invention applied to a sewing machine consisting of a work support 1 having a standard 2, carrying an overhanging arm 3. At the forward end of the overhanging arm 3 is a needle head 4, in which reciprocates a needle bar 5, carrying three needles 6, 7 and 8. Coperating with these three needles beneath the work support is a thread carrying looper 9. The specific complemental stitch forming mechanism forms no part of the present invention and it may be of a different character, if desired.

The needle bar 5 is reciprocated by a needle lever 10 which is connected to the needle bar by a link 11. Also mounted in the needle head 4 is a presser bar 12, which carries a presser foot 13. The fabric is fed underneath the presserfoot by the usual feed dog 14, see Fig. 1. Coperating with the needles and in advance thereof are two ornamental thread guides 15 and 16. The thread guide 15 is carried by an arm 17 which is rigid with a collar 18 fixed to the vertical shaft 19. This vertical shaft is oscillated by a link 2O connected `to a crank arm 22, fixed to a shaft 23 mounted in bearings 24 and 25 at the rear side of the overhanging arm 3 of the machine. This shaft is oscillated by an eccentric strap 26, which is connected to an arm 27 fixed to the shaft and said eccentric strap coperates with an eccentric mounted on a stud shaft which carries the gear 28. This gear is rotated by a gear 29 on the main shaft 30. The other thread guide 16 is fixed to an arm 31 carried by a sleeve 32, which is mounted to oscillate freely on the presser bar. This sleeve has a segment gear which meshes with another segment gear 33 fixed to the lower end of the shaft 19. inasmuch as the arm 17 is directly fixed to the shaft 19 and the arm 31 is oscillated by the segmental gears referred to, it will be apparent that thel thread guide 15 will move in one direction across the line of feed, while the thread f guide 16 is moving in the opposite direction across the line of feed. These thread guides, moving back and forth across the line of feed and making a movement from one side of the line of feed to the other for each complete reciprocation of the needles, form no part of the present invention except as they are used in combination with other elements, which will be hereinafter described.

The ornamental threads, indicated at 0 and 0, are led from the supply through 65 suitable guides and then to the respective guides 15 and 16. Coperating with the thread guides 15 and 16 are two thread hooks 34 and 35. The thread hook 34 is clamped to a reciprocating bar 36, which moves back and forth in a direction substantially parallel to the line of feed, in a supporting bracket 37 which is clamped to the presser bar 12. The thread hook 35 is fixed to a similar bar 38 which likewise reciprocates in the supporting bracket 37 in a direction parallel to the line of feed. These bars 36 and 38 are disposed on opposite sides of the line of feed. Said bars are connected at their rear ends by a cross-bar 39. This cross-bar carries an ear 40, to which is pivoted a link 41. The link 41 is in turn pivoted to an arm 42, which is fixed to a short shaft 43 mounted in bearings 44 and 45 carried by projecting arms extending rearwardly from the bracket 37. At one end of this short shaft 43 is an upwardly projecting arm 46. A link 47 is pivoted at one end to this upwardly extending arm 46, and the other end of this link is connected to a ball stud on the lower end of an arm 48, fixed to a sleeve 49. The sleeve 49 has an outwardly extending arm 50 carrying a ball stud to which an eccentric strap 51 is connected. This eccentric strap cop'erates with an eccentric 52 on the main shaft 50. As this main shaft rotates the arm 48 will be oscillated, which will oscillate the shaft 43 and this, through the link 41, will reciprocate the cross-bar 39 and the bars 36 and 38 connected thereto, so that the thread hooks 34 and 35 will be moved back and forth simultaneously in a direction parallel with the line of feed. Also, coperating with the thread guides 15 and 16 and these thread hooks 34 and 35, are thread fingers 53 and 54. The thread finger 53 is fixed to a bar 55, which is mounted to reciprocate in the bracket 37 in a direction substantially parallel with the line of feed. The thread finger 54 is fixed to a bar 56, which is likewise mounted to reciprocate in the bracket 37 in a direction parallel with the line of feed. These thread fingers, as clearly shown in the drawings, are located on opposite sides of the line of feed and are moved back and forth in a plane beneath the thread hooks 34 and 35. The bars 55 and 56 are connected at their rear ends by a cross-head 57. The arm 42 extends below the shaft 43 forming in reality a second arm 58 and this arm is connected by a link 59 to the cross-head 57. As the shaft 43 is oscillated to move the thread hooks in a rearward direction-that is, in the direction of feed, the thread fingers vwill be simultaneously moved in an opposite direction or toward the front of the machine.

'Cooperating with each thread hook is a thread defiector 60. These two thread deflectors 60 are fixed to the shank of the presser foot and project forwardly substantially over the beaks of the respective thread hooks.

Each thread hook is formed with a beak 6l which projects rearwardly and is deiiected upwardly so that the ornamental thread may be laid across or above the shank of the thread hook and as the thread hook moves rearwardly this beak will catch the ornamental thread extending more or less at an angle from the thread guide down toward the fabric and carrying the ornamental thread in a rearward direction. The thread fingers are each provided with a thread engaging portion 62 which projects outwardly and upwardly, so that, as 'these fingers move forward, they will engage the ornamental thread between the thread hook and the fabric. The thread defiectors 60 are curved upwardly at their outer ends, as at 63, thus forming. a cam shoulder 64 on the underface which crowds the ornamental thread downwardly, so as to insure said thread being engaged by the beak 6l of the thread hooks.

In describing` the operation of my invention, I will follow the operation of one thread guide and the elements which cooperate therewith, it being understood that, while the thread of one guide is being formed into a half twisted loop, the ornamental thread of the other guide is simultaneously being formed into another half twisted loop.

Referring to F ig. 4 of the drawings, it will be noted that the thread guide 15 is at the right of the line of feed and the thread 0 extends from this thread guide between the needles 6 and 7 to the thread hook 34 and from thence to the thread finger 53 and from the thread finger between the needles 6 and 7 to the place where said ornamental thread was locked to the fabric by the previous needle stitch. There is formed, therefore, in the ornamental thread o a triangle into which the needle 6 enters. This triangle formed in the thread also forms a half twist in the thread andis one of the loops of the ligure 8 stitch. At the same time the ornamental thread o is formed into a half twisted loop for the entrance of the needle 8. The thread guide 15 continues its movement to the right and as it moves in a circle the ornamental thread o will be carried underneath the thread deiector 60 on to the shank of the thread hook 35, which meanwhile has moved forward and released the loop which has been formed. The beak of this thread hook 35 on its rearward movement will engage the ornamental thread 0 and the thread finger in its forward movement will engage the ornamental thread between the hook and the previous locking of the thread to the fabric and again form a half twisted loop. In other words, the thread hook and thread finger, first on one side of the line of feed, cooperate with the ornamental thread o and then the thread hook and thread linger on the other side of the line of feed cooperate with the ornamental thread o, and thus a half twisted loop is formed, first for the entrance of one of the outer needles and then for the entrance of the other outer needle, and meanwhile the other ornamental thread o is formed into the half twisted loops and the resulting ornamental stitch is a double ligure 8.

In Fig. 10, I have shown the fabric F, to which the ornamental threads 0 and 0 are stitched. The needle 6 carries a thread a, while the needle 7 carries a thread n and the needle 8 carries a thread a2. These needle threads form parallel lines of stitching which secure the half twisted loops, while the center line of stitches passes centrally between the half twisted loops.

It will be obvious that minor changes in ther details of construction may be made without departing from the spirit of the invention, as set forth in the appended claims.

I-Iaving thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination with a plurality of needles arranged in a line extending transversely of the line of feed, of means for guiding two ornamental threads, means for simultaneously forming half twisted loops in the respective ornamental threads and presenting said half twisted loops for the entrance respectively of the outer needles.

2. rIhe combination with a plurality of needles arranged in a line extending transversely of the line of feed, of means for guiding independently two ornamental threads, a set of devices at each side of the line of feed and cooperating in succession with the thread guiding means for forming half twisted loops in the ornamental threads.

3. The combination with a plurality of needles arranged in a line extending transversely of the line of feed, of means for guiding independently two ornamental threads, a set of devices at each side of the line of feed and cooperating in succession and simultaneously with the thread guiding means for forming half twisted loops in the ornamental threads.

4. The combination with a plurality of needles arranged in a line extending transversely of the line of feed, an ornamental thread guiding member, a thread hook and thread finger at each side of the line of feed with which said thread guiding member cooperates in succession for forming half twisted loops first for one outside needle and then for the other outside needle.

5. The combination with a plurality of needles arranged in a line extending transversely of the line of feed, an ornamental thread guiding member, a thread hook and thread finger at each side of the line of feed with which said thread guiding member cooperates in succession for forming half twisted loops first for one outside needle and then for the other outside needle, and a thread deflector at each side of the line of feed for defiecting the ornamental thread into engagement with its respective thread hook.

6. The combination with stitching mechanism, of an ornamental thread guiding member oscillating back and forth across the line of feed in front of the needle, a thread hook and thread finger at each side of the line of feed, means for reciprocating said thread hook and thread finger in opposite directions, said guiding member cooperating first with the thread hook and thread finger at one side of the line of feed and then with the thread hook and thread nger at the other side of the line of feed for forming l loops in the ornamental thread.

7 The combination with stitching mechanism, of an ornamental thread guiding member oscillating back and forth across the line of feed in front of the needle, a thread hook and thread finger at each side of the line of feed, means for reciprocating said thread hook and thread nger in opposite directions, said guiding member cooperating first with the thread hook and thread finger at one side of the line of feed and then with the thread hook and thread finger at the other side of the line of feed for forming loops in the ornamental thread,

and a thread defiector for engaging the ornamental thread and deflecting the same into engagement with the thread hook.

8. The combination with stitching mechanism, of an ornamental thread guiding member oscillating back and forth across the line of feed in front of the needle, a thread hook and thread finger at each side of the line of feed, means for moving the thread hook and thread finger in opposite directions and in lines parallel with the line of feed, said thread guiding member cooperating first with the thread hook and thread finger at one side of the line of feed and Copies of this patent may be obtained for then the thread hook and thread finger at the other side of the line of feed for forming' half twisted loops in the ornamental thread. I

9. The combination with stitching mechanism, of an ornamental thread guiding member oscillating back and forth across the line of feed in front of the needle, a thread hook and thread finger at each side of the line of feed, means for moving the thread hook and thread finger in opposite directions and in lines parallel with the line of feed, said thread guiding member cooperating first with the thread hook and thread finger at one side of the line of feed and then the thread hook and thread finger at the other side of the line of feed for forming half' twisted loops in the ornamental thread, and a thread defiector cooperating with each thread hook for causing the ornamental thread to be engaged thereby.

10. The combination with stitch forming mechanism, of two thread guides mounted .to oscillate in opposite directions back and forth across the line of feed in front of the stitch forming mechanism, a thread hook and thread finger at each side of the line of feed, means for moving the thread hooks and thread fingers in opposite directions and in line substantially parallel with the line of feed, said thread guides cooperating in succession simultaneo-usly with the thread hooks and thread fingers at the respective sides of the line of feed and forming half twisted loops.

l1. The combination with stitch forming mechanism, of two thread guides mounted to oscillate in opposite directions back and forth across the line of feed in front of the stitch forming mechanism, a thread hook and thread finger at each side of the line of feed, means for moving the thread hooks and thread fingers in opposite directions and in line substantially parallel with the line of feed, said thread guides cooperating in succession simultaneously with the thread hooks and thread fingers at the respective sides of the line of feed forming half twisted loops, said thread guides being so moved as to cooperate alternately with the thread hooks and thread fingers on the opposite sides of the line of feed.

In testimony whereof, I afiix my signature in the presence of two witnesses.

JAMES R. MOFFATT. Witnesses:

S. GEORGE TATE, STEDMAN THOMAS.

Washington, D. C. 

